STATUS display increases to 2800-3200 psig. 2) Make sure the HYD synoptic shows the applicable EDP is in operation.
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747-400 MAINTENANCE MANUAL
 3)  Make sure the applicable system ENGINE PRESS and SYS FAULT lights go off.
 (h) Do a shutdown of the applicable engine (AMM 71-00-00/201).
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747-400 MAINTENANCE MANUAL
 PUMP CHECK VALVE (HOSE-MOUNTED) - REMOVAL/INSTALLATION
______________________________________________________
 1.  General_______
 A.  This procedure contains the tasks to remove and install a check valve installed on a hose.
 B.  There is a check valve assembly installed in these locations for each primary hydraulic system:
 (1)
The engine-driven pump (EDP) pressure hose

 (2)
The air-driven pump (ADP) pressure hose

 (3)
The case drain hose.

 C.  
This procedure applies to the removal and the installation of the check valves for the EDP and the demand pump.

 D.  
You can get access to the EDP check valves through the right thrust reverser half. You can get access to the check valves for the demand pump through the fairing doors on the trailing edge of the strut.

 TASK 29-11-06-004-001
 2.  Check Valve Removal (Fig. 401)___________________
 A.  Standard Tools and Equipment
 (1)
Container - 15 U.S. gallon (60 liter) capacity

 B.  
References

 (1)
AMM 29-11-00/201, Main Hydraulic Supply System

 (2)
AMM 54-62-00/201, Nacelle Strut Access Panels

 (3)
78-31-00/201, Thrust Reverser System

 C.  
Access

 (1)  
Location Zone 412 Engine 1 - Gearbox Forward Face 5:00 o'clock 454 System 1 - Strut Trailing Edge Fairing 422 Engine 2 - Gearbox Forward Face 5:00 o'clock 464 System 2 - Strut Trailing Edge Fairing 432 Engine 3 - Gearbox Forward Face 5:00 o'clock 474 System 3 - Strut Trailing Edge Fairing 442 Engine 4 - Gearbox Forward Face 5:00 o'clock 484 System 4 - Strut Trailing Edge Fairing

 (2)  
Access Panel
 416 Right Thrust Reverser Half - Engine 1
 454A Trailing Edge Fairing Doors - System 1
 426 Right Thrust Reverser Half - Engine 2
 464A Trailing Edge Fairing Doors - System 2
 436 Right Thrust Reverser Half - Engine 3
 474A Trailing Edge Fairing Doors - System 3
 446 Right Thrust Reverser Half - Engine 4
 484A Trailing Edge Fairing Doors - System 4

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747-400
MAINTENANCE MANUAL

HYDRAULIC SUPPLY HOSESEE A ELECTRICAL CONNECTOR
CASE DRAIN 
HOSE 
CHECK VALVE 
FOR THE CASE 
DRAIN HOSE 
HYDRAULIC 
PRESSURE 
HOSE 
FWD 

CHECK VALVE FOR THE HYDRAULIC PRESSURE HOSE ENGINE-DRIVENNOTE: THE ENGINE-DRIVEN PUMP IS PUMPSHOWN. THE AIR-DRIVEN PUMP
A
IS EQUIVALENT.
Pump Check Valves (Hose Mounted) Installation
Figure 401

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